[726] added error messages to recruitment dates in offer creation

[dianawieczorek]

Description:

Form show a message that date of recriutment can't be set after action is finished. Offer with wrong dates cannot be saved in database.

[dianawieczorek]

#726

[codecov-io]

Codecov Report

Merging #1041 into master will decrease coverage by 0.62%.
The diff coverage is 7.4%.

@@            Coverage Diff             @@
##           master    #1041      +/-   ##
==========================================
- Coverage   91.52%   90.89%   -0.63%     
==========================================
  Files         119      119              
  Lines        2901     2922      +21     
  Branches       31       41      +10     
==========================================
+ Hits         2655     2656       +1     
- Misses        242      252      +10     
- Partials        4       14      +10

Impacted Files	Coverage Δ
frontend/src/app/services/metatags.service.ts	47.61% <0%> (ø)	⬆️
...ents/offers/create-offer/create-offer.component.ts	43% <9.09%> (-10.17%)	⬇️

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[magul]

This part of validations should also be run on backend here: https://github.com/CodeForPoznan/volontulo/blob/master/backend/apps/volontulo/serializers.py#L175

[magul]

should end with semicolon

[dianawieczorek]

added

[dianawieczorek]

Backend issue here #1094